Add missing form.js for field value update (:focus style)

assets/js/app.js

@@ -1,5 +1,6 @@
 import './external_links';
 import './message_icons';
+import './forms';
 
 import '../sass/app.scss';
 

assets/js/forms.js

@@ -0,0 +1,11 @@
+// For labels to update their state (css selectors based on the value attribute)
+document.addEventListener('DOMContentLoaded', () => {
+    document.querySelectorAll('input').forEach(el => {
+        if (el.type !== 'checkbox') {
+            el.setAttribute('value', el.value);
+            el.addEventListener('change', () => {
+                el.setAttribute('value', el.value);
+            });
+        }
+    });
+});